2 Answers

 The earliest organ, the hydraulis, was developed by the Greek inventor Ctesibius (flourished 3rd century bc). It utilized a large chamber partly filled with water. The wide mouth of a funnel-like extension from the wind chest was set in the top of the water; as air pressure in the wind chest fell, water rose in the funnel and compressed the air, thus keeping the air pressure constant. The hydraulis was used for public entertainments in ancient Rome and Byzantium. Bellows-type organs were also known to the ancient world. This was the organ that reappeared in Europe in the 8th and 9th centuries, imported from Byzantium and from Arabs who had discovered ancient Greek treatises.

Although some ancient organs had a stop mechanism, this device was forgotten, and on early medieval organs all ranks sounded at once, creating a formidable effect. By the 15th century the stop mechanism had been reinvented, pedal keyboards came into common use, and reed stops (not found on ancient organs) were developed. Smaller organs had also become common: the portative organ, carried by a strap around the player's neck, which had only one rank of pipes and was supplied with wind by a small bellows pumped by the player; the positive organ, self-contained and portable; and the regal, a small instrument with one rank of nasal-sounding reed pipes.

I think Adam owned the first organ.